k1200 fan prob - K-Bikes.com - Excellence in Motion
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post #1 of 13 (permalink) Old Jun 27th, 2007, 3:01 pm Thread Starter
 
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k1200 fan prob

Hello, having a problem with my 1998 k1200rs where the fuse for the radiator fans is blowing out. Replacement of the fuse did not resolve, blew once bike got hot. Tested both fans by applying 12v & both spun with no issues. Both fans do not seem to be warped & are clearing shroud. Replaced fan relay with same results (blown fuse) fans not coming on. When bike runs & gets hot both radiators are hot & beleive they are equally hot, hose to waterpump is hot as well as hose that cncts both tanks. Radiator fluid was replaced last season & tested ok & is filled between to max in overflow tank. If anyone has any information on how & what to test next it would be much appreciated...thx
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post #2 of 13 (permalink) Old Jun 27th, 2007, 4:28 pm
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One thing that may save you some time:
I learned how to run the fans without having to heat up the bike.
Simply disconnect the connector under the seat that leads to the temperature sensor in the head (rear of the engine). It is closest to the tank on the left side. It has two wires (purple and Brown with yellow stripe on my 2002s).

When you disconnect this, with the key on, side-stand up, in Neutral, the ECU instructs the fans to blow. If you pop the fuse, I'd disconnect the fans and check out the relay and wiring to the fans.
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post #3 of 13 (permalink) Old Jun 27th, 2007, 4:41 pm
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Quote:
Originally Posted by KP24
If anyone has any information on how & what to test next it would be much appreciated...
Here's a couple of questions to ponder - between the time the fuse didn't blow and the instance when fuses started to blow, did anything change (added something, or fiddled with something)? And if so, what was it?

Black 2002 K1200RS - "The Beast" (over 100k miles)
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post #4 of 13 (permalink) Old Jun 27th, 2007, 5:38 pm Thread Starter
 
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Quote:
Originally Posted by kniewiderstand
One thing that may save you some time:
I learned how to run the fans without having to heat up the bike.
Simply disconnect the connector under the seat that leads to the temperature sensor in the head (rear of the engine). It is closest to the tank on the left side. It has two wires (purple and Brown with yellow stripe on my 2002s).

When you disconnect this, with the key on, side-stand up, in Neutral, the ECU instructs the fans to blow. If you pop the fuse, I'd disconnect the fans and check out the relay and wiring to the fans.
Ok, sounds good i'll check it out ....thx
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post #5 of 13 (permalink) Old Jun 27th, 2007, 5:44 pm Thread Starter
 
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Quote:
Originally Posted by carnadero
Here's a couple of questions to ponder - between the time the fuse didn't blow and the instance when fuses started to blow, did anything change (added something, or fiddled with something)? And if so, what was it?
did not add or fiddle...overheated first time when I got stuck in traffic, noticed horn stopped working about the same time. I figured the fuse blew & it did. Replaced & continued to blow, replaced $12.00 fan relay hoping for an easy fix (after testing fans) & it was a no go.
PS fans did work prior to getting caught in traffic that day
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post #6 of 13 (permalink) Old Jun 27th, 2007, 6:18 pm Thread Starter
 
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Quote:
Originally Posted by carnadero
Here's a couple of questions to ponder - between the time the fuse didn't blow and the instance when fuses started to blow, did anything change (added something, or fiddled with something)? And if so, what was it?
did not add or fiddle...overheated first time when I got stuck in traffic, noticed horn stopped working about the same time. I figured the fuse blew & it did. Replaced & continued to blow, replaced $12.00 fan relay hoping for an easy fix (after testing fans) & it was a no go.
PS fans did work prior to getting caught in traffic that day
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post #7 of 13 (permalink) Old Jun 27th, 2007, 7:07 pm Thread Starter
 
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Quote:
Originally Posted by kniewiderstand
One thing that may save you some time:
I learned how to run the fans without having to heat up the bike.
Simply disconnect the connector under the seat that leads to the temperature sensor in the head (rear of the engine). It is closest to the tank on the left side. It has two wires (purple and Brown with yellow stripe on my 2002s).

When you disconnect this, with the key on, side-stand up, in Neutral, the ECU instructs the fans to blow. If you pop the fuse, I'd disconnect the fans and check out the relay and wiring to the fans.
great info, I did what you suggested disconnected at sensor & fuse blew.
I disconnected both fans & fuse did not blow.
I connected each fan by itself, when i connected only the right side the fuse did not blow.
When I connected left side fan only, fuse blew.
I then connected the fan from the right side to the left side wiring & it was fine, did not blow the fuse.

The one thing that I don't understand is why when I hooked the left fan directly to 12v did it spin with no issues? Maybe it on its way out & was heating up the wires enough to blow the fuse?

Anyhow thanks a lot it sounds like I need to replace that fan. Do you know if the fans are normally swapped in pairs? Also where I might be able to pick them up for a good price?
Thanks
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post #8 of 13 (permalink) Old Jun 27th, 2007, 7:30 pm
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Quote:
Originally Posted by KP24
great info, I did what you suggested disconnected at sensor & fuse blew.
I disconnected both fans & fuse did not blow.
I connected each fan by itself, when i connected only the right side the fuse did not blow.
When I connected left side fan only, fuse blew.
I then connected the fan from the right side to the left side wiring & it was fine, did not blow the fuse.

The one thing that I don't understand is why when I hooked the left fan directly to 12v did it spin with no issues? Maybe it on its way out & was heating up the wires enough to blow the fuse?

Anyhow thanks a lot it sounds like I need to replace that fan. Do you know if the fans are normally swapped in pairs? Also where I might be able to pick them up for a good price?
Thanks

Glad you solved your problem. Buy your fans separately. Check the prices at Chicago BMW or Hammersly BMW, these dealers seem to have the best prices.

ps. Where the heck is Kendall Park?

Bruce C
'04 K1200RS Capri Blue(totaled)
2008 Triumph Sprint ST
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post #9 of 13 (permalink) Old Jun 27th, 2007, 10:03 pm
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K1200 fan problem

There was a service action on K1200 fans not long after your bike was built. Cooling fans were supposed to be replaced on a VIN range, with improved fans having a blue dot on their frame. It's a bit late for warranty help, but I'm curious whether your bike slipped through the cracks.
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post #10 of 13 (permalink) Old Jun 27th, 2007, 10:11 pm Thread Starter
 
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Quote:
Originally Posted by brucecha
Glad you solved your problem. Buy your fans separately. Check the prices at Chicago BMW or Hammersly BMW, these dealers seem to have the best prices.

ps. Where the heck is Kendall Park?
Thx so I'll only replace the one thats bad thx...Kendall Park is between New Brunswick & Princeton NJ
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